Re: [PATCH v4 0/3] MR3876: Zero-width character handling in GetTextExtentExPoint[AWI]

[Nikolay Sivov (＠nsivov)]

Nikolay Sivov (@nsivov) commented about dlls/win32u/font.c:
>  }
>
>  if (format == GGO_METRICS && !mat && get_gdi_font_glyph_metrics( font, index, &gm, &abc ))
> -
>
> {
> -
>    if (zero_width && (abc.abcA + abc.abcB + abc.abcC == 0))
> -
>        *zero_width = get_GDEF_glyph_class( font, index );
>    goto done;
> -
>
> }
>
> ret = font_funcs->get_glyph_outline( font, index, format, &gm, &abc, buflen, buf, mat, tategaki );
> if (ret == GDI_ERROR) return ret;
> -
>
> if (zero_width && (abc.abcA + abc.abcB + abc.abcC == 0))
> -
>    *zero_width = get_GDEF_glyph_class( font, index );
> -

Why would any non-zero class mean zero_width? Out of four currently defined classes only marks are documented as non-spacing.